Andreas Schwab <schwab@linux-m68k.org> writes:
> On Jul 08 2023, Spencer Baugh wrote:
>
>> +@vindex which-func-display
>> +  By default, Which Function mode displays the current function name
>> +using the mode line.  Customize @code{which-func-display} to
>> +@code{header}, @code{mode}, or @code{both} to use the header line,
>
> Or a list of 'header and/or 'mode.

Oh much better idea, done: